Routine presurgical evaluation of all patients will be conducted. The preoperative use of
steroids, antiepileptics and other medications would be as per standard procedure and would
be documented. In addition detailed MRI evaluation will be performed (including contrast
enhanced MRI study, diffusion MRI, perfusion MR, MR spectroscopy, dynamic-contrast-enhanced
MRI for permeability studies, as well as functional MRI, and tractography if required) not
more than 1 week prior to the date of surgery.
Navigation specific MR sequences would be performed in all patients (both arms).